Final answer:
a) True
Filtrate does indeed pass into the renal tubule through an opening in the bottom of Bowman's capsule, as this is the first stage of the filtration process in the nephron where blood is filtered to form urine.
Step-by-step explanation:
The statement 'Filtrate passes into the renal tubule through an opening in the bottom of Bowman capsule' is true. Filtration in the nephron begins when blood from the afferent arteriole flows through the glomerular capillaries under pressure. This pressure causes water and solutes to be filtered out of the blood and into the space made by Bowman's capsule. The substance that gets filtered, known as filtrate, then enters into the proximal end of the renal tubule.
The filtration process is crucial for the kidneys to produce urine. Substances in the filtrate such as water, salts, organic solids, and waste products like urea are then processed through the renal tubule system. During this journey, some substances are reabsorbed back into the blood, while others are secreted into the filtrate. Eventually, urine is formed and leads into the collecting ducts for excretion.